I get what you’re describing, I think.
With the angle the rounds will be impacting, shy of the deck of the range being legit boulders, the worse case is the rounds might deflect, but would still deflect down range.
Now if you said they were mag dumping into a 48x48” block of stainless steel at 10yrds, I’m with you, but what you describe, risk matrix, you probably had a higher chance of death or injury driving to the range.
This is about as extreme as a quick search yields
The words obtuse and pedantic come to mind